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Provedor de dados:  Braz. J. Plant Physiol.
País:  Brazil
Título:  Growth, photosynthesis and leaf water potential in young plants of Copaifera langsdorffii Desf. (Caesalpiniaceae) under contrasting irradiances
Autores:  Ronquim,Carlos Cesar
Prado,Carlos Henrique B. A.
Souza,João Paulo de
Data:  2009-01-01
Ano:  2009
Palavras-chave:  Cerrado
Biomass partitioning
Chlorophyll fluorescence
Leaf gas exchange
Irradiance
Sunflecks
Resumo:  Growth and leaf nutrient content were compared in young potted plants of Copaifera langsdorffii in sunny and shaded areas without water stress. Besides, carbon assimilation and leaf water relations were evaluated by net photosynthesis, potential photochemical efficiency and leaf water potential during daily courses in dry and rainy periods under natural conditions in both contrasting irradiances. Higher values of total biomass, height and leaf area occurred in sunny than in shaded area. On the other hand, all young plants survived in shade under natural water stress probably by reason of fast and intense biomass accumulation in favor of roots in early development. There was no significant difference about nutrient concentration in leaves between plants growing in sunny and shaded areas. Net photosynthesis in shade increased occasionally when bunches of direct light reached the leaves. Theses sunflecks took place more frequently and at high intensity in dry period but they were more effective for net photosynthesis in rainy period. The ability of young plants to persist under natural conditions in contrasting irradiance up to 1,230 days after sowing could explain the wide distribution of C. langsdorffii in Cerrado physiognomies and in different types of forest.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Identificador:  http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202009000300004
Editor:  Brazilian Journal of Plant Physiology
Relação:  10.1590/S1677-04202009000300004
Formato:  text/html
Fonte:  Brazilian Journal of Plant Physiology v.21 n.3 2009
Direitos:  info:eu-repo/semantics/openAccess
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